Evening Ultrarepo - try this: www.tankcareproducts.co.uk
(why doesn't this come up as a live link? God I'm crap with computers!)
Anyway, this chap is based near Norwich, just down the road from me. I took my spare US T140 tank to him, having heard some good reports. I haven't had it back yet so I can;t give first-hand experience, but when I took it over he seemed a nice bloke and his workshop was full of some really very nice tanks eg: Vincent, Brough, veteran ALS, Triumph, Norton - you name it, there was a tank off it there and looking really beautiful. It's obvious that a lot of people with very rare and expensive bikes entrust their tanks to him, so that made me feel confident about my decision to use him.
He quoted me £350 to strip my tank to bare metal by blasting; blast internally as far as possible but follow-up with chemical metal cleaning; treat with fancy epoxy sealer (same stuff as Caswell) internally; fill dents (there are at least a couple of small ones); repair the central mounting tube where the bottom flange has been damaged; repair the top of the same where it has been brazed; spray with 1969 colour scheme (Olympic Flame over Silver Sheen with Silver Sheen scallops and white pinstripes painted on - not done using tape!
I thought that seemed a very reasonable price. It is supposed to be ready by the end of January, so I'll report back then (with a photo or two hopefully)
Edit: I take it all back, I'm a computer genius - the link does work!